Not the same watch, but I have a week old BB Heritage 79320N, and over the first week, it has lost 10 sec. My timegrapher says +1 to -3 depending on the position. I don't like a watch being slow at all, but I have to be realistic, I suppose. My Omega SMP PO will go months with no net gain or loss, as will my Submariner 16610, so I know that dead-on accuracy can be acheived, despite what some will tell you. I am hoping this new watch will settle in to something on the + side over time.